RFR: 8320001: javac crashes while adding type annotations to the return type of a constructor [v4]

[Vicente Romero]

> Fix for [1] introduced a regression that is making some internal tests fail. Basically fix for [1] is trying to add annotations read from the class file to the corresponding symbol. Constructors are a bit special given that its return type is `void` thus type annotations can't be added to them. This fix is proposing just dropping the type annotation if it applies to the return type of a constructor.
> 
> TIA
> [1] https://bugs.openjdk.org/browse/JDK-8225377

Vicente Romero has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:

 - Merge branch 'master' into JDK-8320001
 - changing test's summary
 - addressing review comments
 - 8320001: javac crashes while adding type annotations to constructor's return type

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/16774/files
  - new: https://git.openjdk.org/jdk/pull/16774/files/0938db68..990c3d3b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16774&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16774&range=02-03

  Stats: 9339 lines in 291 files changed: 6218 ins; 1317 del; 1804 mod
  Patch: https://git.openjdk.org/jdk/pull/16774.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16774/head:pull/16774

PR: https://git.openjdk.org/jdk/pull/16774